1664304425 has 12 divisors (see below), whose sum is σ = 2358557376. Its totient is φ = 1141237200.

The previous prime is 1664304401. The next prime is 1664304457. The reversal of 1664304425 is 5244034661.

It is a de Polignac number, because none of the positive numbers 2^k-1664304425 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4754981 + ... + 4755330.

It is an arithmetic number, because the mean of its divisors is an integer number (196546448).

Almost surely, 2^1664304425 is an apocalyptic number.

It is an amenable number.

1664304425 is a deficient number, since it is larger than the sum of its proper divisors (694252951).

1664304425 is an equidigital number, since it uses as much as digits as its factorization.

1664304425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510328 (or 9510323 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1664304425 is about 40795.8873539968. The cubic root of 1664304425 is about 1185.0706872086.

The spelling of 1664304425 in words is "one billion, six hundred sixty-four million, three hundred four thousand, four hundred twenty-five".